postmarketos-initramfs: log splash messages

log splash messages with the new info log level. This can be useful when
working on headless devices.

Signed-off-by: Caleb Connolly <caleb@postmarketos.org>
Part-of: postmarketOS/pmaports!6172

main/postmarketos-initramfs/init_functions.sh

@@ -1158,6 +1158,7 @@ check_keys() {
 
 # $1: Message to show
 show_splash() {
+	info "SPLASH: $1"
 	if [ "$nosplash" = "y" ]; then
 		return
 	fi